feat(footer): add copyright since & custom text (#74)

closes https://github.com/CaiJimmy/hugo-theme-stack/issues/55

exampleSite/config.yaml

@@ -22,6 +22,10 @@ params:
     rssFullContent: true
     favicon:
 
+    footer:
+        since: 2020
+        customText:
+
     dateFormat:
         published: Jan 02, 2006
         lastUpdated: Jan 02, 2006 15:04 MST

layouts/index.html

@@ -11,7 +11,7 @@
     </section>
 
     {{- partial "pagination.html" . -}}
-    {{ partialCached "footer/footer" . }}
+    {{- partial "footer/footer" . -}}
 {{ end }}
 
 {{ define "right-sidebar" }}

layouts/partials/footer/footer.html

@@ -1,7 +1,18 @@
 {{- $ThemeVersion := "1.1.0" -}}
 <footer class="site-footer">
-    <section class="copyright">&copy; {{ now.Format "2006" }} {{ .Site.Title }}</section>
+    <section class="copyright">
+        &copy; 
+        {{ if and (.Site.Params.footer.since) (ne .Site.Params.footer.since (int (now.Format "2006"))) }}
+            {{ .Site.Params.footer.since }} - 
+        {{ end }}
+        {{ now.Format "2006" }} {{ .Site.Title }}
+    </section>
+    
     <section class="powerby">
+        {{ with .Site.Params.footer.customText }}
+            {{ . | safeHTML }} <br/>
+        {{ end }}
+
         {{- $Generator := `<a href="https://gohugo.io/" target="_blank" rel="noopener">Hugo</a>` -}}
         {{- $Theme := printf `<b><a href="https://github.com/CaiJimmy/hugo-theme-stack" target="_blank" rel="noopener" data-version="%s">Stack</a></b>` $ThemeVersion -}}
         {{- $DesignedBy := `<a href="https://jimmycai.com" target="_blank" rel="noopener">Jimmy</a>` -}}